For a cell, the cell reaction is Mg(s)+Cu2+(aq)→Mg2+(aq)+Cu(s). If the S.R.P. values of Mg and Cu are −2.37 V and +0.34 V respectively, the EMF of the cell is:
Which metal is considered best for protecting the other metal?
E0Fe2+/Fe=−0.44V,E0Zn2+/Zn=−0.76VE0Mg2+/Mg=−2.37V,E0Cu2+/Cu=−0.34V
The voltage of a cell whose halfcells are given below is:
Mg2++2e−→Mg(s);E0=−2.37V
Cu2++2e−→Cu(s);E0=+0.34V standard EMF of the cell is: